*{
    margin:0;
    padding:0;
}
.wrapper{
    position: relative;
    width:900px;
    height:700px;
    margin:50px auto;
    border:1px solid #000;
}
.wrapper .start{
    width:100px;
    height:30px;
    background-color:#ccc;
    color:#333;
    padding:5px;
    text-align: center;
    line-height: 30px;
    cursor: pointer;
    margin:20px auto;
}
.wrapper .imgBox{
    position: relative;
    width:300px;
    height:300px;
    border:1px solid #000;
    box-sizing: border-box;
    margin:30px auto;
}
.wrapper img{
    position: absolute;
    right:0;
    top:0;
    width:200px;
    height:200px;
}
.wrapper .imgCell{
    position: absolute;
    box-shadow: 0 0 8px #fff;
    border-radius:4px;
    background: url('./pic.jpg');
    cursor: move;
}
